<!DOCTYPE html>
<html lang="zh" dir="ltr" class="client-nojs">
<head>
<title>正则表达式库</title>
<meta charset="UTF-8">
<meta name="generator" content="MediaWiki 1.21.2">
<link rel="shortcut icon" href="../../common/favicon.ico">
<link rel="stylesheet" href="../../common/ext.css">
<meta name="ResourceLoaderDynamicStyles" content="">
<link rel="stylesheet" href="../../common/site_modules.css">
<style>a:lang(ar),a:lang(ckb),a:lang(fa),a:lang(kk-arab),a:lang(mzn),a:lang(ps),a:lang(ur){text-decoration:none}#toc{display:none}.editsection{display:none}
/* cache key: mwiki1-mwiki_zh_:resourceloader:filter:minify-css:7:15cea3ec788a65b5187d4018eed543bf */</style>

<script src="../../common/startup_scripts.js"></script>
<script>if(window.mw){
mw.config.set({"wgCanonicalNamespace":"","wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"cpp/regex","wgTitle":"cpp/regex","wgCurRevisionId":62831,"wgArticleId":3483,"wgIsArticle":true,"wgAction":"view","wgUserName":null,"wgUserGroups":["*"],"wgCategories":[],"wgBreakFrames":false,"wgPageContentLanguage":"zh","wgSeparatorTransformTable":["",""],"wgDigitTransformTable":["",""],"wgDefaultDateFormat":"zh","wgMonthNames":["","1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月"],"wgMonthNamesShort":["","1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月"],"wgRelevantPageName":"cpp/regex","wgUserVariant":"zh","wgRestrictionEdit":[],"wgRestrictionMove":[]});
}</script><script>if(window.mw){
mw.loader.implement("user.options",function(){mw.user.options.set({"ccmeonemails":0,"cols":80,"date":"default","diffonly":0,"disablemail":0,"disablesuggest":0,"editfont":"default","editondblclick":0,"editsection":0,"editsectiononrightclick":0,"enotifminoredits":0,"enotifrevealaddr":0,"enotifusertalkpages":1,"enotifwatchlistpages":0,"extendwatchlist":0,"externaldiff":0,"externaleditor":0,"fancysig":0,"forceeditsummary":0,"gender":"unknown","hideminor":0,"hidepatrolled":0,"imagesize":2,"justify":0,"math":1,"minordefault":0,"newpageshidepatrolled":0,"nocache":0,"noconvertlink":0,"norollbackdiff":0,"numberheadings":0,"previewonfirst":0,"previewontop":1,"quickbar":5,"rcdays":7,"rclimit":50,"rememberpassword":0,"rows":25,"searchlimit":20,"showhiddencats":0,"showjumplinks":1,"shownumberswatching":1,"showtoc":0,"showtoolbar":1,"skin":"cppreference2","stubthreshold":0,"thumbsize":2,"underline":2,"uselivepreview":0,"usenewrc":0,"watchcreations":0,"watchdefault":0,"watchdeletion":0,
"watchlistdays":3,"watchlisthideanons":0,"watchlisthidebots":0,"watchlisthideliu":0,"watchlisthideminor":0,"watchlisthideown":0,"watchlisthidepatrolled":0,"watchmoves":0,"wllimit":250,"variant":"zh","language":"zh","searchNs0":true,"searchNs1":false,"searchNs2":false,"searchNs3":false,"searchNs4":false,"searchNs5":false,"searchNs6":false,"searchNs7":false,"searchNs8":false,"searchNs9":false,"searchNs10":false,"searchNs11":false,"searchNs12":false,"searchNs13":false,"searchNs14":false,"searchNs15":false,"gadget-MathJax":1,"gadget-ColiruCompiler":1});;},{},{});mw.loader.implement("user.tokens",function(){mw.user.tokens.set({"editToken":"+\\","patrolToken":false,"watchToken":false});;},{},{});
/* cache key: mwiki1-mwiki_zh_:resourceloader:filter:minify-js:7:258d7cd6aa9aa67dee25e01fb6a9e505 */
}</script>
<script>if(window.mw){
mw.loader.load(["mediawiki.page.startup","mediawiki.legacy.wikibits","mediawiki.legacy.ajax"]);
}</script>
<style type="text/css">/*<![CDATA[*/
.source-cpp {line-height: normal;}
.source-cpp li, .source-cpp pre {
	line-height: normal; border: 0px none white;
}
/**
 * GeSHi Dynamically Generated Stylesheet
 * --------------------------------------
 * Dynamically generated stylesheet for cpp
 * CSS class: source-cpp, CSS id: 
 * GeSHi (C) 2004 - 2007 Nigel McNie, 2007 - 2008 Benny Baumann
 * (http://qbnz.com/highlighter/ and http://geshi.org/)
 * --------------------------------------
 */
.cpp.source-cpp .de1, .cpp.source-cpp .de2 {font: normal normal 1em/1.2em monospace; margin:0; padding:0; background:none; vertical-align:top;}
.cpp.source-cpp  {font-family:monospace;}
.cpp.source-cpp .imp {font-weight: bold; color: red;}
.cpp.source-cpp li, .cpp.source-cpp .li1 {font-weight: normal; vertical-align:top;}
.cpp.source-cpp .ln {width:1px;text-align:right;margin:0;padding:0 2px;vertical-align:top;}
.cpp.source-cpp .li2 {font-weight: bold; vertical-align:top;}
.cpp.source-cpp .kw1 {color: #0000dd;}
.cpp.source-cpp .kw2 {color: #0000ff;}
.cpp.source-cpp .kw3 {color: #0000dd;}
.cpp.source-cpp .kw4 {color: #0000ff;}
.cpp.source-cpp .co1 {color: #909090;}
.cpp.source-cpp .co2 {color: #339900;}
.cpp.source-cpp .coMULTI {color: #ff0000; font-style: italic;}
.cpp.source-cpp .es0 {color: #008000; font-weight: bold;}
.cpp.source-cpp .es1 {color: #008000; font-weight: bold;}
.cpp.source-cpp .es2 {color: #008000; font-weight: bold;}
.cpp.source-cpp .es3 {color: #008000; font-weight: bold;}
.cpp.source-cpp .es4 {color: #008000; font-weight: bold;}
.cpp.source-cpp .es5 {color: #008000; font-weight: bold;}
.cpp.source-cpp .br0 {color: #008000;}
.cpp.source-cpp .sy0 {color: #008000;}
.cpp.source-cpp .sy1 {color: #000080;}
.cpp.source-cpp .sy2 {color: #000040;}
.cpp.source-cpp .sy3 {color: #000040;}
.cpp.source-cpp .sy4 {color: #008080;}
.cpp.source-cpp .st0 {color: #008000;}
.cpp.source-cpp .nu0 {color: #000080;}
.cpp.source-cpp .nu6 {color: #000080;}
.cpp.source-cpp .nu8 {color: #000080;}
.cpp.source-cpp .nu12 {color: #000080;}
.cpp.source-cpp .nu16 {color:#000080;}
.cpp.source-cpp .nu17 {color:#000080;}
.cpp.source-cpp .nu18 {color:#000080;}
.cpp.source-cpp .nu19 {color:#000080;}
.cpp.source-cpp .ln-xtra, .cpp.source-cpp li.ln-xtra, .cpp.source-cpp div.ln-xtra {background-color: #ffc;}
.cpp.source-cpp span.xtra { display:block; }

/*]]>*/
</style><style type="text/css">/*<![CDATA[*/
.source-text {line-height: normal;}
.source-text li, .source-text pre {
	line-height: normal; border: 0px none white;
}
/**
 * GeSHi Dynamically Generated Stylesheet
 * --------------------------------------
 * Dynamically generated stylesheet for text
 * CSS class: source-text, CSS id: 
 * GeSHi (C) 2004 - 2007 Nigel McNie, 2007 - 2008 Benny Baumann
 * (http://qbnz.com/highlighter/ and http://geshi.org/)
 * --------------------------------------
 */
.text.source-text .de1, .text.source-text .de2 {font: normal normal 1em/1.2em monospace; margin:0; padding:0; background:none; vertical-align:top;}
.text.source-text  {font-family:monospace;}
.text.source-text .imp {font-weight: bold; color: red;}
.text.source-text li, .text.source-text .li1 {font-weight: normal; vertical-align:top;}
.text.source-text .ln {width:1px;text-align:right;margin:0;padding:0 2px;vertical-align:top;}
.text.source-text .li2 {font-weight: bold; vertical-align:top;}
.text.source-text .ln-xtra, .text.source-text li.ln-xtra, .text.source-text div.ln-xtra {background-color: #ffc;}
.text.source-text span.xtra { display:block; }

/*]]>*/
</style><!--[if lt IE 7]><style type="text/css">body{behavior:url("/mwiki/skins/cppreference2/csshover.min.htc")}</style><![endif]--></head>
<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_regex skin-cppreference2 action-view cpp-navbar">
        <!-- header -->
        <!-- /header -->
        <!-- content -->
<div id="cpp-content-base">
            <div id="content">
                <a id="top"></a>
                <div id="mw-js-message" style="display:none;"></div>
                                <!-- firstHeading -->
<h1 id="firstHeading" class="firstHeading">正则表达式库</h1>
                <!-- /firstHeading -->
                <!-- bodyContent -->
                <div id="bodyContent">
                                        <!-- tagline -->
                    <div id="siteSub">来自cppreference.com</div>
                    <!-- /tagline -->
                                        <!-- subtitle -->
                    <div id="contentSub"><span class="subpages">&lt; <a href="../cpp.html" title="cpp">cpp</a></span></div>
                    <!-- /subtitle -->
                                                            <!-- bodycontent -->
                    <div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr"><div class="t-navbar" style=""><div class="t-navbar-sep"> </div><div class="t-navbar-head"><a href="../cpp.html" title="cpp"> C++</a><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="line-height:1.1em;">
<tr class="t-nv"><td colspan="5"> <a href="language.html" title="cpp/language">语言</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header.html" title="cpp/header">标准库头文件</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="freestanding.html" title="cpp/freestanding"> 自立与有宿主实现</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="named_req.html" title="cpp/named req">具名要求</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="utility.html#.E8.AF.AD.E8.A8.80.E6.94.AF.E6.8C.81" title="cpp/utility">语言支持库</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="concepts.html" title="cpp/concepts">概念库</a> <span class="t-mark-rev t-since-cxx20">(C++20)</span> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="error.html" title="cpp/error">诊断库</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="utility.html" title="cpp/utility">工具库</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="string.html" title="cpp/string">字符串库</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="https://zh.cppreference.com/w/cpp/container" title="cpp/container">容器库</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="iterator.html" title="cpp/iterator">迭代器库</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="ranges.html" title="cpp/ranges"> 范围库</a> <span class="t-mark-rev t-since-cxx20">(C++20)</span> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="algorithm.html" title="cpp/algorithm">算法库</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="numeric.html" title="cpp/numeric">数值库</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="io.html" title="cpp/io">输入/输出库</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="locale.html" title="cpp/locale">本地化库</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <strong class="selflink">正则表达式库</strong> <span class="t-mark-rev t-since-cxx11">(C++11)</span> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="atomic.html" title="cpp/atomic">原子操作库</a> <span class="t-mark-rev t-since-cxx11">(C++11)</span> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="thread.html" title="cpp/thread">线程支持库</a> <span class="t-mark-rev t-since-cxx11">(C++11)</span> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="filesystem.html" title="cpp/filesystem">文件系统库</a> <span class="t-mark-rev t-since-cxx17">(C++17)</span> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="experimental.html" title="cpp/experimental">技术规范</a> </td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><strong class="selflink">正则表达式库</strong><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h1"><td colspan="5"> 类</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/basic_regex.html" title="cpp/regex/basic regex"><span class="t-lines"><span>basic_regex</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/sub_match.html" title="cpp/regex/sub match"><span class="t-lines"><span>sub_match</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/match_results.html" title="cpp/regex/match results"><span class="t-lines"><span>match_results</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 算法</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/regex_match.html" title="cpp/regex/regex match"><span class="t-lines"><span>regex_match</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/regex_search.html" title="cpp/regex/regex search"><span class="t-lines"><span>regex_search</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/regex_replace.html" title="cpp/regex/regex replace"><span class="t-lines"><span>regex_replace</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 迭代器</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/regex_iterator.html" title="cpp/regex/regex iterator"><span class="t-lines"><span>regex_iterator</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/regex_token_iterator.html" title="cpp/regex/regex token iterator"><span class="t-lines"><span>regex_token_iterator</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 异常</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/regex_error.html" title="cpp/regex/regex error"><span class="t-lines"><span>regex_error</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 特性</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/regex_traits.html" title="cpp/regex/regex traits"><span class="t-lines"><span>regex_traits</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 常量</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/syntax_option_type.html" title="cpp/regex/syntax option type"><span class="t-lines"><span>syntax_option_type</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/match_flag_type.html" title="cpp/regex/match flag type"><span class="t-lines"><span>match_flag_type</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/error_type.html" title="cpp/regex/error type"><span class="t-lines"><span>error_type</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 正则表达式文法</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/ecmascript.html" title="cpp/regex/ecmascript"><span class="t-lines"><span>Modified ECMAScript-262</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于头文件 <code>&lt;regex&gt;</code> </div>
</td></tr>
</table>
<p>正则表达式库提供表示<a href="https://en.wikipedia.org/wiki/Regular_expression" class="extiw" title="enwiki:Regular expression">正则表达式</a>的类，正则表达式是一种用于在字符串中匹配模式的微型语言。下列数种对象上的操作能刻画几乎所有带正则表达式的操作：
</p>
<ul><li> <b>目标序列</b>。为模式而搜索到的字符序列。这可以是二个迭代器所指定的范围、空终止字符串或一个 <span class="t-lc"><a href="string/basic_string.html" title="cpp/string/basic string">std::string</a></span> 。
</li></ul>
<ul><li> <b>模式</b>。这是正则表达式自身。它确定构成匹配者。它是从带特定语法的字符串构成的 <span class="t-lc"><a href="regex/basic_regex.html" title="cpp/regex/basic regex">std::basic_regex</a></span> 类型对象。受支持的语法变体的描述见 <a href="regex/syntax_option_type.html" title="cpp/regex/syntax option type">syntax_option_type</a> 。
</li></ul>
<ul><li> <b>匹配的数组</b>。关于匹配的信息可作为 <span class="t-lc"><a href="regex/match_results.html" title="cpp/regex/match results">std::match_results</a></span> 类型对象获取。
</li></ul>
<ul><li> <b>替换字符串</b>。这是确定如何替换匹配的字符串，受支持的语法变体的描述见 <a href="regex/match_flag_type.html" title="cpp/regex/match flag type">match_flag_type</a> 。 
</li></ul>
<h3><span class="mw-headline" id=".E4.B8.BB.E7.B1.BB">主类</span></h3>
<p>这些类封装正则表达式和在字符的目标序列中匹配正则表达式的结果。
</p>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="regex/basic_regex.html" title="cpp/regex/basic regex"> <span class="t-lines"><span>basic_regex</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  正则表达式对象 <br> <span class="t-mark">(类模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="regex/sub_match.html" title="cpp/regex/sub match"> <span class="t-lines"><span>sub_match</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  标识子表达式所匹配的字符序列 <br> <span class="t-mark">(类模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="regex/match_results.html" title="cpp/regex/match results"> <span class="t-lines"><span>match_results</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  标识一个正则表达式匹配，包含所有子表达式匹配 <br> <span class="t-mark">(类模板)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E7.AE.97.E6.B3.95">算法</span></h3>
<p>这些算法将封装于 regex 的正则表达式应用到字符的目标序列。
</p>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="regex/regex_match.html" title="cpp/regex/regex match"> <span class="t-lines"><span>regex_match</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  尝试匹配一个正则表达式到整个字符序列 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="regex/regex_search.html" title="cpp/regex/regex search"> <span class="t-lines"><span>regex_search</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  尝试匹配一个正则表达式到字符序列的任何部分 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="regex/regex_replace.html" title="cpp/regex/regex replace"> <span class="t-lines"><span>regex_replace</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>   以格式化的替换文本来替换正则表达式匹配的出现位置  <br> <span class="t-mark">(函数模板)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.AD.E4.BB.A3.E5.99.A8">迭代器</span></h3>
<p>regex_iterator 用于遍历在序列中找到的匹配正则表达式的整个集合。
</p>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="regex/regex_iterator.html" title="cpp/regex/regex iterator"> <span class="t-lines"><span>regex_iterator</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  迭代一个字符序列中的所有正则表达式匹配 <br> <span class="t-mark">(类模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="regex/regex_token_iterator.html" title="cpp/regex/regex token iterator"> <span class="t-lines"><span>regex_token_iterator</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  迭代给定字符串中的所有正则表达式匹配中的指定子表达式，或迭代未匹配的子字符串  <br> <span class="t-mark">(类模板)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
<p>此类定义作为异常抛出以报告来自正则表达式库错误的类型。
</p>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="regex/regex_error.html" title="cpp/regex/regex error"> <span class="t-lines"><span>regex_error</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>   报告正则表达式库生成的错误 <br> <span class="t-mark">(类)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E7.89.B9.E6.80.A7">特性</span></h3>
<p>regex_traits 类用于封装 regex 的本地化方面。
</p>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="regex/regex_traits.html" title="cpp/regex/regex traits"> <span class="t-lines"><span>regex_traits</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  提供正则表达式库所需的关于字符类型的元信息 <br> <span class="t-mark">(类模板)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E5.B8.B8.E9.87.8F">常量</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于命名空间 <code>std::regex_constants</code></div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="regex/syntax_option_type.html" title="cpp/regex/syntax option type"> <span class="t-lines"><span>syntax_option_type</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  控制正则表达式行为的通用选项 <br> <span class="t-mark">(typedef)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="regex/match_flag_type.html" title="cpp/regex/match flag type"> <span class="t-lines"><span>match_flag_type</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  特定于匹配的选项 <br> <span class="t-mark">(typedef)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="regex/error_type.html" title="cpp/regex/error type"> <span class="t-lines"><span>error_type</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  描述不同类型的匹配错误 <br> <span class="t-mark">(typedef)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="co2">#include &lt;string&gt;</span>
<span class="co2">#include &lt;regex&gt;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    <a href="string/basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> s <span class="sy1">=</span> <span class="st0">"Some people, when confronted with a problem, think "</span>
        <span class="st0">"<span class="es1">\"</span>I know, I'll use regular expressions.<span class="es1">\"</span> "</span>
        <span class="st0">"Now they have two problems."</span><span class="sy4">;</span>
 
    <a href="http://zh.cppreference.com/w/cpp/regex/basic_regex"><span class="kw2000">std::<span class="me2">regex</span></span></a> self_regex<span class="br0">(</span><span class="st0">"REGULAR EXPRESSIONS"</span>,
            <a href="regex/syntax_option_type.html"><span class="kw2032">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">ECMAScript</span></span></a> <span class="sy3">|</span> <a href="regex/syntax_option_type.html"><span class="kw2028">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">icase</span></span></a><span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">if</span> <span class="br0">(</span><a href="regex/regex_search.html"><span class="kw2013">std::<span class="me2">regex_search</span></span></a><span class="br0">(</span>s, self_regex<span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span>
        <a href="io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"Text contains the phrase 'regular expressions'<span class="es1">\n</span>"</span><span class="sy4">;</span>
    <span class="br0">}</span>
 
    <a href="http://zh.cppreference.com/w/cpp/regex/basic_regex"><span class="kw2000">std::<span class="me2">regex</span></span></a> word_regex<span class="br0">(</span><span class="st0">"(<span class="es1">\\</span>w+)"</span><span class="br0">)</span><span class="sy4">;</span>
    <span class="kw4">auto</span> words_begin <span class="sy1">=</span> 
        <a href="regex/regex_iterator.html"><span class="kw2018">std::<span class="me2">sregex_iterator</span></span></a><span class="br0">(</span>s.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, s.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, word_regex<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw4">auto</span> words_end <span class="sy1">=</span> <a href="regex/regex_iterator.html"><span class="kw2018">std::<span class="me2">sregex_iterator</span></span></a><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
 
    <a href="io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"Found "</span>
              <span class="sy1">&lt;&lt;</span> <a href="iterator/distance.html"><span class="kw673">std::<span class="me2">distance</span></span></a><span class="br0">(</span>words_begin, words_end<span class="br0">)</span>
              <span class="sy1">&lt;&lt;</span> <span class="st0">" words<span class="es1">\n</span>"</span><span class="sy4">;</span>
 
    <span class="kw4">const</span> <span class="kw4">int</span> N <span class="sy1">=</span> <span class="nu0">6</span><span class="sy4">;</span>
    <a href="io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"Words longer than "</span> <span class="sy1">&lt;&lt;</span> N <span class="sy1">&lt;&lt;</span> <span class="st0">" characters:<span class="es1">\n</span>"</span><span class="sy4">;</span>
    <span class="kw1">for</span> <span class="br0">(</span><a href="regex/regex_iterator.html"><span class="kw2018">std::<span class="me2">sregex_iterator</span></span></a> i <span class="sy1">=</span> words_begin<span class="sy4">;</span> i <span class="sy3">!</span><span class="sy1">=</span> words_end<span class="sy4">;</span> <span class="sy2">++</span>i<span class="br0">)</span> <span class="br0">{</span>
        <a href="regex/match_results.html"><span class="kw2010">std::<span class="me2">smatch</span></span></a> match <span class="sy1">=</span> <span class="sy2">*</span>i<span class="sy4">;</span>
        <a href="string/basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> match_str <span class="sy1">=</span> match.<span class="me1">str</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
        <span class="kw1">if</span> <span class="br0">(</span>match_str.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&gt;</span> N<span class="br0">)</span> <span class="br0">{</span>
            <a href="io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"  "</span> <span class="sy1">&lt;&lt;</span> match_str <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
        <span class="br0">}</span>
    <span class="br0">}</span>
 
    <a href="http://zh.cppreference.com/w/cpp/regex/basic_regex"><span class="kw2000">std::<span class="me2">regex</span></span></a> long_word_regex<span class="br0">(</span><span class="st0">"(<span class="es1">\\</span>w{7,})"</span><span class="br0">)</span><span class="sy4">;</span>
    <a href="string/basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> new_s <span class="sy1">=</span> <a href="regex/regex_replace.html"><span class="kw2014">std::<span class="me2">regex_replace</span></span></a><span class="br0">(</span>s, long_word_regex, <span class="st0">"[$&amp;]"</span><span class="br0">)</span><span class="sy4">;</span>
    <a href="io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> new_s <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">Text contains the phrase 'regular expressions'
Found 20 words
Words longer than 6 characters:
  confronted
  problem
  regular
  expressions
  problems
Some people, when [confronted] with a [problem], think 
"I know, I'll use [regular] [expressions]." Now they have two [problems].</pre></div></div> 
</div>

<!-- 
NewPP limit report
Preprocessor visited node count: 3336/1000000
Preprocessor generated node count: 5846/1000000
Post‐expand include size: 121362/2097152 bytes
Template argument size: 25365/2097152 bytes
Highest expansion depth: 20/40
Expensive parser function count: 0/100
-->

<!-- Saved in parser cache with key mwiki1-mwiki_zh_:pcache:idhash:3483-0!*!0!!zh!*!zh!* and timestamp 20191018014228 -->
</div>                    <!-- /bodycontent -->
                                        <!-- printfooter -->
                    <div class="printfooter">
                    来自“<a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/regex&amp;oldid=62831">https://zh.cppreference.com/mwiki/index.php?title=cpp/regex&amp;oldid=62831</a>”                    </div>
                    <!-- /printfooter -->
                                                            <!-- catlinks -->
                    <!-- /catlinks -->
                                                            <div class="visualClear"></div>
                    <!-- debughtml -->
                                        <!-- /debughtml -->
                </div>
                <!-- /bodyContent -->
            </div>
        </div>
        <!-- /content -->
        <!-- footer -->
        <div id="cpp-footer-base" class="noprint">
            <div id="footer">
                        <div id="cpp-navigation">
            <h5>导航</h5>
            <ul><li><a href="https://zh.cppreference.com/w/cpp/regex">Online version</a></li><li>Offline version retrieved 2020-03-14 18:00.</li></ul></div>
                        <ul id="footer-info">
                                    <li id="footer-info-lastmod"> 本页面最后修改于2019年10月17日 (星期四) 18:42。</li>
                                    <li id="footer-info-viewcount">此页面已被浏览过42,801次。</li>
                            </ul>
                    </div>
        </div>
        <!-- /footer -->
        <script>if(window.mw){
mw.loader.state({"site":"loading","user":"missing","user.groups":"ready"});
}</script>
<script src="../../common/skin_scripts.js"></script>
<script>if(window.mw){
mw.loader.load(["mediawiki.action.view.postEdit","mediawiki.user","mediawiki.page.ready","mediawiki.searchSuggest","mediawiki.hidpi","ext.gadget.MathJax","ext.gadget.ColiruCompiler"], null, true);
}</script>
<script src="../../common/site_scripts.js"></script>
<script type="text/javascript">
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-2828341-1']);
_gaq.push(['_setDomainName', 'cppreference.com']);
_gaq.push(['_trackPageview']);
</script><!-- Served in 0.077 secs. -->
	</body>
<!-- Cached 20191018051342 -->
</html>